/**
* Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
* send out queued IP packets. Updates cache with snooped address pairs.
*
* Should be called for incoming ARP packets. The pbuf in the argument
* is freed by this function.
*
* @param netif The lwIP network interface on which the ARP packet pbuf arrived.
* @param pbuf The ARP packet that arrived on netif. Is freed by this function.
* @param ethaddr Ethernet address of netif.
*
* @return NULL
*
* @see pbuf_free()
*/
void
etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
{
struct etharp_hdr *hdr;
/* these are aligned properly, whereas the ARP header fields might not be */
struct ip_addr sipaddr, dipaddr;
u8_t i;
u8_t for_us;
LWIP_ASSERT("netif != NULL", netif != NULL);
/* drop short ARP packets */
if (p->tot_len < sizeof(struct etharp_hdr)) {
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | 1, ("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len, sizeof(struct etharp_hdr)));
pbuf_free(p);
return;
}
hdr = p->payload;
/* get aligned copies of addresses */
*(struct ip_addr2 *)&sipaddr = hdr->sipaddr;
*(struct ip_addr2 *)&dipaddr = hdr->dipaddr;
/* this interface is not configured? */
if (netif->ip_addr.addr == 0) {
for_us = 0;
} else {
/* ARP packet directed to us? */
for_us = ip_addr_cmp(&dipaddr, &(netif->ip_addr));
}
/* ARP message directed to us? */
if (for_us) {
/* add IP address in ARP cache; assume requester wants to talk to us.
* can result in directly sending the queued packets for this host. */
update_arp_entry(netif, &sipaddr, &(hdr->shwaddr), ETHARP_TRY_HARD);
/* ARP message not directed to us? */
} else {
/* update the source IP address in the cache, if present */
update_arp_entry(netif, &sipaddr, &(hdr->shwaddr), 0);
}
/* now act on the message itself */
switch (htons(hdr->opcode)) {
/* ARP request? */
case ARP_REQUEST:
/* ARP request. If it asked for our address, we send out a
* reply. In any case, we time-stamp any existing ARP entry,
* and possiby send out an IP packet that was queued on it. */
LWIP_DEBUGF (ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
/* ARP request for our address? */
if (for_us) {
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
/* re-use pbuf to send ARP reply */
hdr->opcode = htons(ARP_REPLY);
hdr->dipaddr = hdr->sipaddr;
hdr->sipaddr = *(struct ip_addr2 *)&netif->ip_addr;
for(i = 0; i < netif->hwaddr_len; ++i) {
hdr->dhwaddr.addr[i] = hdr->shwaddr.addr[i];
hdr->shwaddr.addr[i] = ethaddr->addr[i];
hdr->ethhdr.dest.addr[i] = hdr->dhwaddr.addr[i];
hdr->ethhdr.src.addr[i] = ethaddr->addr[i];
}
hdr->hwtype = htons(HWTYPE_ETHERNET);
ARPH_HWLEN_SET(hdr, netif->hwaddr_len);
hdr->proto = htons(ETHTYPE_IP);
ARPH_PROTOLEN_SET(hdr, sizeof(struct ip_addr));
hdr->ethhdr.type = htons(ETHTYPE_ARP);
/* return ARP reply */
netif->linkoutput(netif, p);
/* we are not configured? */
} else if (netif->ip_addr.addr == 0) {
/* { for_us == 0 and netif->ip_addr.addr == 0 } */
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
/* request was not directed to us */
} else {
/* { for_us == 0 and netif->ip_addr.addr != 0 } */
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
}
break;
case ARP_REPLY:
/* ARP reply. We already updated the ARP cache earlier. */
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
/* DHCP wants to know about ARP replies from any host with an
* IP address also offered to us by the DHCP server. We do not
* want to take a duplicate IP address on a single network.
* @todo How should we handle redundant (fail-over) interfaces?
* */
dhcp_arp_reply(netif, &sipaddr);
#endif
break;
default:
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
break;
}
/* free ARP packet */
pbuf_free(p);
}
/*-----------------------------------------------------------------------------------*/
struct pbuf *
etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p, struct pbuf **queued)
{
struct etharp_hdr *hdr;
u8_t i;
if(p->tot_len < sizeof(struct etharp_hdr)) {
DEBUGF(ETHARP_DEBUG, ("etharp_etharp_input: packet too short (%d/%d)\n", (int) p->tot_len, (int) sizeof(struct etharp_hdr)));
return NULL;
}
hdr = p->payload;
switch(htons(hdr->opcode)) {
case ARP_REQUEST:
*queued = update_arp_entry(&(hdr->sipaddr), &(hdr->shwaddr), 0);
/* ARP request. If it asked for our address, we send out a
reply. */
DEBUGF(ETHARP_DEBUG, ("etharp_arp_input: ARP request\n"));
if(!memcmp(&(hdr->dipaddr), &(netif->ip_addr), sizeof (hdr->dipaddr))) {
pbuf_ref(p);
hdr->opcode = htons(ARP_REPLY);
memcpy (&(hdr->dipaddr), &(hdr->sipaddr), sizeof (hdr->dipaddr));
memcpy (&(hdr->sipaddr), &(netif->ip_addr), sizeof (hdr->sipaddr));
for(i = 0; i < 6; ++i) {
hdr->dhwaddr.addr[i] = hdr->shwaddr.addr[i];
hdr->shwaddr.addr[i] = ethaddr->addr[i];
hdr->ethhdr.dest.addr[i] = hdr->dhwaddr.addr[i];
hdr->ethhdr.src.addr[i] = ethaddr->addr[i];
}
hdr->hwtype = htons(HWTYPE_ETHERNET);
ARPH_HWLEN_SET(hdr, 6);
hdr->proto = htons(ETHTYPE_IP);
ARPH_PROTOLEN_SET(hdr, sizeof(struct ip_addr));
hdr->ethhdr.type = htons(ETHTYPE_ARP);
return p;
}
break;
case ARP_REPLY:
/* ARP reply. We insert or update the ARP table. */
DEBUGF(ETHARP_DEBUG, ("etharp_arp_input: ARP reply\n"));
if(!memcmp (&(hdr->dipaddr), &(netif->ip_addr), sizeof (hdr->dipaddr))) {
#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
dhcp_arp_reply(&hdr->sipaddr);
#endif
/* add_arp_entry() will return a pbuf that has previously been
queued waiting for an ARP reply. */
}
/* whether its destined for us or not, we update the arp table */
return add_arp_entry(&(hdr->sipaddr), &(hdr->shwaddr));
break;
default:
DEBUGF(ETHARP_DEBUG, ("etharp_arp_input: unknown type %d\n", htons(hdr->opcode)));
break;
}
return NULL;
}
/**
* Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
* send out queued IP packets. Updates cache with snooped address pairs.
*
* Should be called for incoming ARP packets. The pbuf in the argument
* is freed by this function.
*
* @param netif The lwIP network interface on which the ARP packet pbuf arrived.
* @param pbuf The ARP packet that arrived on netif. Is freed by this function.
* @param ethaddr Ethernet address of netif.
*
* @return NULL
*
* @see pbuf_free()
*/
void
etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
{
struct etharp_hdr *hdr;
/* these are aligned properly, whereas the ARP header fields might not be */
struct ip_addr sipaddr, dipaddr;
u8_t i;
u8_t for_us;
/* drop short ARP packets */
if (p->tot_len < sizeof(struct etharp_hdr)) {
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | 1, ("etharp_arp_input: packet dropped, too short (%d/%d)\n", p->tot_len, sizeof(struct etharp_hdr)));
pbuf_free(p);
return;
}
hdr = p->payload;
/* get aligned copies of addresses */
*(struct ip_addr2 *)&sipaddr = hdr->sipaddr;
*(struct ip_addr2 *)&dipaddr = hdr->dipaddr;
/* this interface is not configured? */
if (netif->ip_addr.addr == 0) {
for_us = 0;
} else {
/* ARP packet directed to us? */
for_us = ip_addr_cmp(&dipaddr, &(netif->ip_addr));
}
/* ARP message directed to us? */
if (for_us) {
/* add IP address in ARP cache; assume requester wants to talk to us.
* can result in directly sending the queued packets for this host. */
update_arp_entry(netif, &sipaddr, &(hdr->shwaddr), ETHARP_CREATE);
/* ARP message not directed to us? */
} else {
/* update the source IP address in the cache, if present */
update_arp_entry(netif, &sipaddr, &(hdr->shwaddr), 0);
}
/* now act on the message itself */
switch (htons(hdr->opcode)) {
/* ARP request? */
case ARP_REQUEST:
/* ARP request. If it asked for our address, we send out a
* reply. In any case, we time-stamp any existing ARP entry,
* and possiby send out an IP packet that was queued on it. */
LWIP_DEBUGF (ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
/* ARP request for our address? */
if (for_us) {
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
/* re-use pbuf to send ARP reply */
hdr->opcode = htons(ARP_REPLY);
hdr->dipaddr = hdr->sipaddr;
hdr->sipaddr = *(struct ip_addr2 *)&netif->ip_addr;
for(i = 0; i < netif->hwaddr_len; ++i) {
hdr->dhwaddr.addr[i] = hdr->shwaddr.addr[i];
hdr->shwaddr.addr[i] = ethaddr->addr[i];
hdr->ethhdr.dest.addr[i] = hdr->dhwaddr.addr[i];
hdr->ethhdr.src.addr[i] = ethaddr->addr[i];
}
hdr->hwtype = htons(HWTYPE_ETHERNET);
ARPH_HWLEN_SET(hdr, netif->hwaddr_len);
hdr->proto = htons(ETHTYPE_IP);
ARPH_PROTOLEN_SET(hdr, sizeof(struct ip_addr));
hdr->ethhdr.type = htons(ETHTYPE_ARP);
/* return ARP reply */
netif->linkoutput(netif, p);
#ifdef LINKLOCAL_IP //Ron Add for Rendzvous 12/10/04
if( mRENVEnable && (LinkLocal_get_current_state() != NO_USE )
&& is_linklocal_ip( dipaddr.addr ) )
{
if( (LinkLocal_get_current_state() != IDLE) && ip_conflict_cnt++ == 0 )
linklocal_alarm();
else if( (LinkLocal_get_current_state() == IDLE) && ip_conflict_cnt++ == 0)
{
linklocal_alarm();
}
}
#endif
/* we are not configured? */
} else if (netif->ip_addr.addr == 0) {
/* { for_us == 0 and netif->ip_addr.addr == 0 } */
#ifdef LINKLOCAL_IP //Ron Add for Rendzvous 12/10/04
if( mRENVEnable && (LinkLocal_get_current_state() != NO_USE )
&& is_linklocal_ip( dipaddr.addr ) )
{
if( (LinkLocal_get_current_state() != IDLE) && ip_conflict_cnt++ == 0 )
linklocal_alarm();
else if( (LinkLocal_get_current_state() == IDLE) && ip_conflict_cnt++ == 0)
{
linklocal_alarm();
}
hdr->opcode = htons(ARP_REPLY);
hdr->sipaddr = hdr->dipaddr;
hdr->dipaddr = *(struct ip_addr2 *)&netif->ip_addr;
// hdr->dipaddr = hdr->sipaddr;
// hdr->sipaddr = *(struct ip_addr2 *)&netif->ip_addr;
for(i = 0; i < netif->hwaddr_len; ++i) {
hdr->dhwaddr.addr[i] = hdr->shwaddr.addr[i];
hdr->shwaddr.addr[i] = ethaddr->addr[i];
hdr->ethhdr.dest.addr[i] = hdr->dhwaddr.addr[i];
hdr->ethhdr.src.addr[i] = ethaddr->addr[i];
}
hdr->hwtype = htons(HWTYPE_ETHERNET);
ARPH_HWLEN_SET(hdr, netif->hwaddr_len);
hdr->proto = htons(ETHTYPE_IP);
ARPH_PROTOLEN_SET(hdr, sizeof(struct ip_addr));
hdr->ethhdr.type = htons(ETHTYPE_ARP);
netif->linkoutput(netif, p);
}
#endif
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
/* request was not directed to us */
} else {
/* { for_us == 0 and netif->ip_addr.addr != 0 } */
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
}
break;
case ARP_REPLY:
/* ARP reply. We already updated the ARP cache earlier. */
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
/* DHCP wants to know about ARP replies to our wanna-have-address */
if (for_us){
dhcp_arp_reply(netif, &sipaddr);
}
#endif
#ifdef LINKLOCAL_IP //Ron Add for Rendzvous 12/10/04
if( mRENVEnable && (LinkLocal_get_current_state() != NO_USE ) && is_linklocal_ip( sipaddr.addr ) )
{
if( (LinkLocal_get_current_state() != IDLE) && ip_conflict_cnt++ == 0 )
linklocal_alarm();
else if( (LinkLocal_get_current_state() == IDLE) && ip_conflict_cnt++ == 0)
{
linklocal_alarm();
}
}
#endif
break;
default:
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %d\n", htons(hdr->opcode)));
break;
}
/* free ARP packet */
pbuf_free(p);
}
/**
* Responds to ARP requests, updates ARP entries and sends queued IP packets.
*
* Should be called for incoming ARP packets. The pbuf in the argument
* is freed by this function.
*
* @param netif The lwIP network interface on which the ARP packet pbuf arrived.
* @param pbuf The ARP packet that arrived on netif. Is freed by this function.
* @param ethaddr Ethernet address of netif.
*
* @return NULL
*
* @see pbuf_free()
*/
struct pbuf *
etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
{
struct etharp_hdr *hdr;
u8_t i;
/* drop short ARP packets */
if (p->tot_len < sizeof(struct etharp_hdr)) {
DEBUGF(ETHARP_DEBUG | DBG_TRACE | 1, ("etharp_arp_input: packet too short (%ld/%u)\n", p->tot_len, sizeof(struct etharp_hdr)));
pbuf_free(p);
return NULL;
}
hdr = p->payload;
switch (htons(hdr->opcode)) {
/* ARP request? */
case ARP_REQUEST:
/* ARP request. If it asked for our address, we send out a
reply. In any case, we time-stamp any existing ARP entry,
and possiby send out an IP packet that was queued on it. */
DEBUGF (ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
/* we are not configured? */
if (netif->ip_addr.addr == 0) {
DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
pbuf_free(p);
return NULL;
}
/* update the ARP cache */
update_arp_entry(netif, &(hdr->sipaddr), &(hdr->shwaddr), 0);
/* ARP request for our address? */
if (ip_addr_cmp(&(hdr->dipaddr), &(netif->ip_addr))) {
DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
/* re-use pbuf to send ARP reply */
hdr->opcode = htons(ARP_REPLY);
ip_addr_set(&(hdr->dipaddr), &(hdr->sipaddr));
ip_addr_set(&(hdr->sipaddr), &(netif->ip_addr));
for(i = 0; i < netif->hwaddr_len; ++i) {
hdr->dhwaddr.addr[i] = hdr->shwaddr.addr[i];
hdr->shwaddr.addr[i] = ethaddr->addr[i];
hdr->ethhdr.dest.addr[i] = hdr->dhwaddr.addr[i];
hdr->ethhdr.src.addr[i] = ethaddr->addr[i];
}
hdr->hwtype = htons(HWTYPE_ETHERNET);
ARPH_HWLEN_SET(hdr, netif->hwaddr_len);
hdr->proto = htons(ETHTYPE_IP);
ARPH_PROTOLEN_SET(hdr, sizeof(struct ip_addr));
hdr->ethhdr.type = htons(ETHTYPE_ARP);
/* return ARP reply */
netif->linkoutput(netif, p);
} else {
DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: incoming ARP request was not for us.\n"));
}
break;
case ARP_REPLY:
/* ARP reply. We insert or update the ARP table. */
DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
/* DHCP needs to know about ARP replies */
dhcp_arp_reply(netif, &hdr->sipaddr);
#endif
/* ARP reply directed to us? */
if (ip_addr_cmp(&(hdr->dipaddr), &(netif->ip_addr))) {
DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: incoming ARP reply is for us\n"));
/* update_the ARP cache, ask to insert */
update_arp_entry(netif, &(hdr->sipaddr), &(hdr->shwaddr), ARP_INSERT_FLAG);
/* ARP reply not directed to us */
} else {
DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: incoming ARP reply is not for us\n"));
/* update the destination address pair */
update_arp_entry(netif, &(hdr->sipaddr), &(hdr->shwaddr), 0);
/* update the destination address pair */
update_arp_entry(netif, &(hdr->dipaddr), &(hdr->dhwaddr), 0);
}
break;
default:
DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %d\n", htons(hdr->opcode)));
break;
}
/* free ARP packet */
pbuf_free(p);
p = NULL;
/* nothing to send, we did it! */
return NULL;
}
/**
* Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
* send out queued IP packets. Updates cache with snooped address pairs.
*
* Should be called for incoming ARP packets. The pbuf in the argument
* is freed by this function.
*
* @param netif The lwIP network interface on which the ARP packet pbuf arrived.
* @param pbuf The ARP packet that arrived on netif. Is freed by this function.
* @param ethaddr Ethernet address of netif.
*
* @return NULL
*
* @see pbuf_free()
*/
struct pbuf *
etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
{
struct etharp_hdr *hdr;
u8_t i;
u8_t for_us;
/* drop short ARP packets */
if (p->tot_len < sizeof(struct etharp_hdr)) {
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | 1, ("etharp_arp_input: packet dropped, too short (%d/%d)\n", p->tot_len, sizeof(struct etharp_hdr)));
pbuf_free(p);
return NULL;
}
hdr = p->payload;
/* this interface is not configured? */
if (netif->ip_addr.addr == 0) {
for_us = 0;
} else {
/* ARP packet directed to us? */
for_us = ip_addr_cmp(&(hdr->dipaddr), &(netif->ip_addr));
}
/* add or update entries in the ARP cache */
if (for_us) {
/* insert IP address in ARP cache (assume requester wants to talk to us)
* we might even send out a queued packet to this host */
update_arp_entry(netif, &(hdr->sipaddr), &(hdr->shwaddr), ARP_INSERT_FLAG);
/* request was not directed to us, but snoop anyway */
} else {
/* update the source IP address in the cache */
update_arp_entry(netif, &(hdr->sipaddr), &(hdr->shwaddr), 0);
}
switch (htons(hdr->opcode)) {
/* ARP request? */
case ARP_REQUEST:
/* ARP request. If it asked for our address, we send out a
reply. In any case, we time-stamp any existing ARP entry,
and possiby send out an IP packet that was queued on it. */
LWIP_DEBUGF (ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
/* we are not configured? */
if (netif->ip_addr.addr == 0) {
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
pbuf_free(p);
return NULL;
}
/* ARP request for our address? */
if (for_us) {
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
/* re-use pbuf to send ARP reply */
hdr->opcode = htons(ARP_REPLY);
ip_addr_set(&(hdr->dipaddr), &(hdr->sipaddr));
ip_addr_set(&(hdr->sipaddr), &(netif->ip_addr));
for(i = 0; i < netif->hwaddr_len; ++i) {
hdr->dhwaddr.addr[i] = hdr->shwaddr.addr[i];
hdr->shwaddr.addr[i] = ethaddr->addr[i];
hdr->ethhdr.dest.addr[i] = hdr->dhwaddr.addr[i];
hdr->ethhdr.src.addr[i] = ethaddr->addr[i];
}
hdr->hwtype = htons(HWTYPE_ETHERNET);
ARPH_HWLEN_SET(hdr, netif->hwaddr_len);
hdr->proto = htons(ETHTYPE_IP);
ARPH_PROTOLEN_SET(hdr, sizeof(struct ip_addr));
hdr->ethhdr.type = htons(ETHTYPE_ARP);
/* return ARP reply */
netif->linkoutput(netif, p);
/* request was not directed to us */
} else {
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: incoming ARP request was not for us.\n"));
}
break;
case ARP_REPLY:
/* ARP reply. We insert or update the ARP table later. */
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
/* DHCP wants to know about ARP replies to our wanna-have-address */
if (for_us) dhcp_arp_reply(netif, &hdr->sipaddr);
#endif
break;
default:
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %d\n", htons(hdr->opcode)));
break;
}
/* free ARP packet */
pbuf_free(p);
p = NULL;
/* nothing to send, we did it! */
return NULL;
}
